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   &#160;<span id="projectnumber">0.2</span>
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   <div id="projectbrief">Generic and Reusable Parallel Pattern Interface</div>
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<li class="navelem"><a class="el" href="dir_d44c64559bbebec7f509842c48db8b23.html">include</a></li><li class="navelem"><a class="el" href="dir_09623dfa51a61b2fbf8544d2a5f9ce36.html">tbb</a></li>  </ul>
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<div class="title">tbb/stencil.h</div>  </div>
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<a href="tbb_2stencil_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;</div><div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="preprocessor">#ifndef GRPPI_TBB_STENCIL_H</span></div><div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="preprocessor">#define GRPPI_TBB_STENCIL_H</span></div><div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;</div><div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="preprocessor">#ifdef GRPPI_TBB</span></div><div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;</div><div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="parallel__execution__tbb_8h.html">parallel_execution_tbb.h</a>&quot;</span></div><div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;</div><div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="preprocessor">#include &lt;tbb/tbb.h&gt;</span></div><div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;</div><div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="keyword">namespace </span><a class="code" href="namespacegrppi.html">grppi</a> {</div><div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;</div><div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> InputIt, <span class="keyword">typename</span> OutputIt, <span class="keyword">typename</span> StencilTransformer, </div><div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;          <span class="keyword">typename</span> Neighbourhood, <span class="keyword">typename</span> ... OtherInputIts&gt;</div><div class="line"><a name="l00034"></a><span class="lineno"><a class="line" href="namespacegrppi.html#a0b60eeb44e66da9219f2d83edaa1e2b1">   34</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="namespacegrppi.html#a0b60eeb44e66da9219f2d83edaa1e2b1">stencil_impl</a>(<a class="code" href="classgrppi_1_1parallel__execution__tbb.html">parallel_execution_tbb</a> &amp; ex, </div><div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;                  <span class="keywordtype">int</span> elements_per_thread, <span class="keywordtype">int</span> index, </div><div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;                  InputIt first, InputIt last, OutputIt first_out, </div><div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;                  StencilTransformer transform_op, Neighbourhood neighbour_op, </div><div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;                  OtherInputIts ... other_firsts){</div><div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;  <span class="keyword">auto</span> begin = next(first, elements_per_thread * index);</div><div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;  <span class="keyword">auto</span> end = (index==ex.<a class="code" href="classgrppi_1_1parallel__execution__tbb.html#a4658679d34e759c78eed069d60aa8f8b">concurrency_degree</a>()-1)?</div><div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;      last :</div><div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;      next(first, elements_per_thread * (index+1));</div><div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;  <span class="keyword">auto</span> out = next(first_out, elements_per_thread * index);</div><div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;  <a class="code" href="namespacegrppi.html#a6222cb3c656980019f3e0365a475f1be">advance_iterators</a>(elements_per_thread* index, other_firsts ...);</div><div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;  <span class="keywordflow">while</span>(begin!=end){</div><div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;    *out = transform_op(begin, neighbour_op(begin, other_firsts ...));</div><div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;    begin++;</div><div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;    <a class="code" href="namespacegrppi.html#a6222cb3c656980019f3e0365a475f1be">advance_iterators</a>(other_firsts...);</div><div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;    out++;</div><div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;  }</div><div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;}</div><div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;</div><div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;</div><div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> InputIt, <span class="keyword">typename</span> OutputIt, <span class="keyword">typename</span> StencilTransformer, </div><div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;          <span class="keyword">typename</span> Neighbourhood&gt;</div><div class="line"><a name="l00078"></a><span class="lineno"><a class="line" href="group__stencil__pattern__tbb.html#ga4b94dcbfe8ad5fccae9269f870fbabf8">   78</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="group__stencil__pattern__native.html#ga4c11627ced8c65f6cf4a67fdb4869d3d">stencil</a>(<a class="code" href="classgrppi_1_1parallel__execution__tbb.html">parallel_execution_tbb</a> &amp; ex, </div><div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;             InputIt first, InputIt last, OutputIt first_out, </div><div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;             StencilTransformer transform_op, </div><div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;             Neighbourhood neighbour_op) </div><div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;{</div><div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;  <span class="keywordtype">int</span> size = last - first;</div><div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;  <span class="keywordtype">int</span> elements_per_thread = size/ex.<a class="code" href="classgrppi_1_1parallel__execution__tbb.html#a4658679d34e759c78eed069d60aa8f8b">concurrency_degree</a>();</div><div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;  tbb::task_group g;</div><div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;</div><div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i=1; i&lt;ex.<a class="code" href="classgrppi_1_1parallel__execution__tbb.html#a4658679d34e759c78eed069d60aa8f8b">concurrency_degree</a>(); ++i) {</div><div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;    g.run(</div><div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;      [&amp;neighbour_op, &amp;transform_op, first, first_out, elements_per_thread, </div><div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;          i, last, ex]() {</div><div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;        <span class="keyword">auto</span> begin = first + (elements_per_thread * i);</div><div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;        <span class="keyword">auto</span> end = (i==ex.<a class="code" href="classgrppi_1_1parallel__execution__tbb.html#a4658679d34e759c78eed069d60aa8f8b">concurrency_degree</a>()-1)?</div><div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;            last :</div><div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;            next(first, elements_per_thread * (i+1));</div><div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;</div><div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;        <span class="keyword">auto</span> out = next(first_out, elements_per_thread * i);</div><div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;        <span class="keywordflow">while</span> (begin!=end) {</div><div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;          *out = transform_op(begin, neighbour_op(begin));</div><div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;          begin++;</div><div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;          out++;</div><div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;        }</div><div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;      }</div><div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;    );</div><div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;  }</div><div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;</div><div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;  <span class="keyword">auto</span> end = first + elements_per_thread;</div><div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;  <span class="keywordflow">while</span> (first!=end) {</div><div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;    *first_out = transform_op(first, neighbour_op(first));</div><div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;    first++;</div><div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;    first_out++;</div><div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;  }</div><div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;</div><div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;  g.wait();</div><div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;}</div><div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;</div><div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> InputIt, <span class="keyword">typename</span> OutputIt, <span class="keyword">typename</span> StencilTransformer, </div><div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;          <span class="keyword">typename</span> Neighbourhood, <span class="keyword">typename</span> ... OtherInputIts&gt;</div><div class="line"><a name="l00134"></a><span class="lineno"><a class="line" href="group__stencil__pattern__tbb.html#gab44f514be6479bb9ab952b8d09a44d4c">  134</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="group__stencil__pattern__native.html#ga4c11627ced8c65f6cf4a67fdb4869d3d">stencil</a>(<a class="code" href="classgrppi_1_1parallel__execution__tbb.html">parallel_execution_tbb</a> &amp; ex, </div><div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;             InputIt first, InputIt last, OutputIt first_out, </div><div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;             StencilTransformer transform_op, Neighbourhood neighbour_op, </div><div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;             OtherInputIts ... other_firsts ) </div><div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;{</div><div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;  <span class="keywordtype">int</span> size = distance(first,last);</div><div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;  <span class="keywordtype">int</span> elements_per_thread = size/ex.<a class="code" href="classgrppi_1_1parallel__execution__tbb.html#a4658679d34e759c78eed069d60aa8f8b">concurrency_degree</a>();</div><div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;  tbb::task_group g;</div><div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;  <span class="keywordflow">for</span>(<span class="keywordtype">int</span> index=1; index&lt;ex.<a class="code" href="classgrppi_1_1parallel__execution__tbb.html#a4658679d34e759c78eed069d60aa8f8b">concurrency_degree</a>(); ++index) {</div><div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;    g.run(</div><div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;      [neighbour_op, transform_op, first, first_out, elements_per_thread, </div><div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;          index, last, &amp;ex, other_firsts...]()</div><div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;      {</div><div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;        stencil_impl(ex, elements_per_thread, index,</div><div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;            first, last, first_out, transform_op, </div><div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;            neighbour_op, other_firsts...);</div><div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;      }</div><div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160;    );</div><div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;  }</div><div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;</div><div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;  <span class="keyword">auto</span> end = next(first, elements_per_thread);</div><div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;  <span class="keywordflow">while</span>(first!=end){</div><div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;    *first_out = transform_op(first, neighbour_op(first,other_firsts ...));</div><div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;    first++;</div><div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;    <a class="code" href="namespacegrppi.html#a6222cb3c656980019f3e0365a475f1be">advance_iterators</a>( other_firsts ... );</div><div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;    first_out++;</div><div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;  }</div><div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;</div><div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;  g.wait();</div><div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;}</div><div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;</div><div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160;}</div><div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;</div><div class="line"><a name="l00172"></a><span class="lineno">  172</span>&#160;<span class="preprocessor">#endif</span></div><div class="line"><a name="l00173"></a><span class="lineno">  173</span>&#160;</div><div class="line"><a name="l00174"></a><span class="lineno">  174</span>&#160;<span class="preprocessor">#endif</span></div><div class="ttc" id="namespacegrppi_html"><div class="ttname"><a href="namespacegrppi.html">grppi</a></div><div class="ttdef"><b>Definition:</b> callable_traits.h:24</div></div>
<div class="ttc" id="group__stencil__pattern__native_html_ga4c11627ced8c65f6cf4a67fdb4869d3d"><div class="ttname"><a href="group__stencil__pattern__native.html#ga4c11627ced8c65f6cf4a67fdb4869d3d">grppi::stencil</a></div><div class="ttdeci">void stencil(parallel_execution_native &amp;ex, InputIt first, InputIt last, OutputIt first_out, StencilTransformer transform_op, Neighbourhood neighbour_op)</div><div class="ttdoc">Invoke Stencil pattern on a data sequence with native parallel execution. </div><div class="ttdef"><b>Definition:</b> native/stencil.h:53</div></div>
<div class="ttc" id="classgrppi_1_1parallel__execution__tbb_html"><div class="ttname"><a href="classgrppi_1_1parallel__execution__tbb.html">grppi::parallel_execution_tbb</a></div><div class="ttdoc">TBB parallel execution policy. </div><div class="ttdef"><b>Definition:</b> parallel_execution_tbb.h:37</div></div>
<div class="ttc" id="namespacegrppi_html_a6222cb3c656980019f3e0365a475f1be"><div class="ttname"><a href="namespacegrppi.html#a6222cb3c656980019f3e0365a475f1be">grppi::advance_iterators</a></div><div class="ttdeci">void advance_iterators(size_t delta, InputIt &amp;...in)</div><div class="ttdef"><b>Definition:</b> iterator.h:29</div></div>
<div class="ttc" id="namespacegrppi_html_a0b60eeb44e66da9219f2d83edaa1e2b1"><div class="ttname"><a href="namespacegrppi.html#a0b60eeb44e66da9219f2d83edaa1e2b1">grppi::stencil_impl</a></div><div class="ttdeci">void stencil_impl(parallel_execution_tbb &amp;ex, int elements_per_thread, int index, InputIt first, InputIt last, OutputIt first_out, StencilTransformer transform_op, Neighbourhood neighbour_op, OtherInputIts...other_firsts)</div><div class="ttdef"><b>Definition:</b> tbb/stencil.h:34</div></div>
<div class="ttc" id="classgrppi_1_1parallel__execution__tbb_html_a4658679d34e759c78eed069d60aa8f8b"><div class="ttname"><a href="classgrppi_1_1parallel__execution__tbb.html#a4658679d34e759c78eed069d60aa8f8b">grppi::parallel_execution_tbb::concurrency_degree</a></div><div class="ttdeci">int concurrency_degree() const noexcept</div><div class="ttdoc">Get number of grppi trheads. </div><div class="ttdef"><b>Definition:</b> parallel_execution_tbb.h:73</div></div>
<div class="ttc" id="parallel__execution__tbb_8h_html"><div class="ttname"><a href="parallel__execution__tbb_8h.html">parallel_execution_tbb.h</a></div></div>
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